imap error on autocreate_special folder

Hello,
we are running horde 5.2.12/imp 6.2.16 on Debian 8 against cyrus 2.5.10 
also on Debian.
In the imp/config/backends.local.php we define

'special_mboxes' => array(
          IMP_Mailbox::MBOX_DRAFTS => 'Drafts',
          IMP_Mailbox::MBOX_SENT => 'Sent',
          IMP_Mailbox::MBOX_SPAM => 'Junk',
          IMP_Mailbox::MBOX_TEMPLATES => 'Templates',
          IMP_Mailbox::MBOX_TRASH => 'Trash',
     ),
     'autocreate_special' => true,

If a user login error messages for creating the special folders comes 
up. The IMAP log shows:

C: 7 CREATE INBOX.Drafts USE (\Drafts)
S: 7 BAD Unexpected extra arguments to Create
 >> Command 7 took 0,0008 seconds.
C: 8 LIST () "" (INBOX.Spam)
S: 8 OK Completed (0.000 secs)
 >> Command 8 took 0,0012 seconds.
C: 9 CREATE INBOX.Spam USE (\Junk)
S: 9 BAD Unexpected extra arguments to Create
 >> Command 9 took 0,0012 seconds.

On the web ui for imp the user can create folders manually.
Thanks for any help or hint.
Best regards Rene

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